I like blocking on vanguard where I have a 50% bigger window for it, and vanguard can build defensively.
I like fencing everywhere else because I don't want a singular timing fuckup to end a run (which can easily happen on absolute or hard siege, and has many times).

Either way, the fundamental issue is that many people feel like they need block to do noticeably adequate damage because mobs are outright too beefy and weapon stats are just silly. The artificer block chain sword being objectively better than any of the relic chain swords is a pathetic negligence on saber's part. Most fencing weapons have shit native damage or speed.

Despite being on this website for 20 years, I will never understand some people's insistence on making being a contrarian their entire personality. There are use cases for both fencing and block, and you are allowed to like one, both or nothing.